OPTIMIZATION OF SHAPE AND MEMBER STIFFNESS DISTRIBUTIONS FOR SINGLE-LAYER RETICULATED SHELLS OF RECTANGULAR PLAN

摘要

This paper tries an efficient scheme for the optimization of both shape and member stiffness distributions in order to create a spatial structure with a higher buckling strength than the one created by just shape optimization. The shape and member stiffness distributions for single-layer reticulated shells of rectangular plan are optimized for a target to maximize their linear buckling load for a vertical uniformly distributed load or a static seismic load. How the optimization results in different shape and stiffness distributions is discussed and investigated using four different kinds of numerical procedures. The buckling behavior of the optimum reticulated shells is also examined through elastic and elasto-plastic buckling analyses.